on Photogenic or Hydrocarbon-Oils from Coal. 119 
in the hands of a company capable of, c veloping the business to any extent 
which Serners or the arts may require 
In the sa e year Fayent in reporting upon Selligue’s water-gas, remarks 
upon the meat importance: of the new industry of distilling oil from shales 
mtroduce 
tr 
In the pyens year we again find pela before we Academy § request- 
ing that body to appoint a committee to examine the merits of his new — 
of | ipdighting his process of distilling bitomin nous s eH ae s on the great scale 
by means of apparatus, each one of which fur _ from 1,000 to 1,400 veut 
Of crude oil per day—this being about 10 per of the weight of the shale 
employed, and being almost all which a igs in gt be raw m ponag ; also of his 
parating various products from the crude oil, some of which are 
_[n 1838 Selligue also obtained a new patent{ “for the employment of mineral 
oils for lighting.” In his specification s# informs us that the principles upon 
which his processes for rendering the oil — from ie proper for the 
purposes of direct** illumination depe ae 
e 
most odorous, the presence of cha yeas eaune the oil to have too pte 
fluidity for the ite of ‘ordinar 
The operations, continues elligue, poe: in gay distilling the bitumin- 
he Shale, and col ecting the liquid products in large receivers ese od 
ucts are redistilled, and divided into fractions by refrigerating. They ar 
treated wi peteyntes sulphuric acid for a longer or shorter time secon 
m the tar, and washed with water. Slaked lime is then added and a cur- 
rent of steam passed through the oil in order to carry off by oe all the 
potan volatile when odorous liquids. This last, says oe, » is most im- 
my : 
This e oh 
rene — that of Blum and Moneuse (vid. Su; me Selligue nao 
ms ote aeevenie 3 in Brevets d’Invention, Ixx, 269. Of these stil two are 
ed 1884; 0, 1835; and three, 1836. Fora description of his process of gas- 
making see a Bulletin de la Soe ome d' Encouragement, Oct. 1838, “4 896; or 
ae 
Compte es Rendus, 183 
+ Dingler’s Patstoctaterhan Jos Journal, \xviii, 201; from Budletin de la Société 
“eouragement, Dec, 1837, a 493. 
Comptes Rendus, 1838, vii, 897. 
Comptes R Rendus, = 86i: rs in Dingler’s Polytechnisches Journal, lxxyii, 137. 
es Brevets @ Invention, \xv i, 395. 
The term « direct * Nedra is constantly used by poe in contradistine: 
indirect use of the oil in his process of gas-making 
